** FILE ** Chicago Mayor Rahm Emanuel (center) is flanked by Chicago Public Schools CEO Jean-Claude Brizard (left) and school board President David Vitale during a news conference on Tuesday, Sept. 18, 2012. (AP Photo/Charles Rex Arbogast)

Photo by: Charles Rex Arbogast

** FILE ** Chicago Mayor Rahm Emanuel (center) is flanked by Chicago Public Schools CEO Jean-Claude Brizard (left) and school board President David Vitale during a news conference on Tuesday, Sept. 18, 2012. (AP Photo/Charles Rex Arbogast)